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Fig. 3A. —77-year-old man with history of colon cancer and weight of 95 kg. Contrast-enhanced CT scans (mediastinal window settings) using 140 kVp and 260 mAs (A) and 140 kVp and 130 mAs (B) show that although chest wall structures appear noisy, mediastinal structures are optimally visualized on low-dose image.

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